CN112389233A - Energy conversion device and vehicle - Google Patents

Energy conversion device and vehicle Download PDF

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Publication number
CN112389233A
CN112389233A CN201910755485.8A CN201910755485A CN112389233A CN 112389233 A CN112389233 A CN 112389233A CN 201910755485 A CN201910755485 A CN 201910755485A CN 112389233 A CN112389233 A CN 112389233A
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China
Prior art keywords
coils
coil
phase
conversion device
energy conversion
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Granted
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CN201910755485.8A
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Chinese (zh)
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CN112389233B (en
Inventor
凌和平
谢飞跃
潘华
李�杰
翟震
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BYD Co Ltd
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BYD Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B60L53/24—Using the vehicle's propulsion converter for charging
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The application provides an energy conversion device and a vehicle, wherein the energy conversion device comprises a reversible PWM rectifier, a motor and a switch module, the motor comprises a first group of coils and a second group of coils, and the first group of coils and the second group of coils are mutual inductors for electromagnetic coupling; when the energy conversion device is connected with the charging and discharging equipment through an external charging port or a discharging port, a charging and discharging loop is formed by an external battery, the reversible PWM rectifier and the mutual inductance coil in the motor and the charging and discharging equipment, and in the process of charging and discharging the energy conversion device and the charging and discharging equipment, the winding coil and the silicon steel sheet of the motor play a role of voltage transformation by arranging two groups of mutual inductance coils for electromagnetic coupling in the motor, so that an electrical isolation effect is achieved in the charging and discharging process of the energy conversion device, an energy coupling transmission function is realized, and the cost and the volume of the whole vehicle are not increased.

Description

Energy conversion device and vehicle
Technical Field
The application relates to the technical field of vehicles, in particular to an energy conversion device and a vehicle.
Background
With the development and rapid popularization of electric vehicles, the charging technology of electric vehicle batteries becomes more and more important, and the charging technology needs to meet the requirements of different users and the adaptability and compatibility of different batteries and different charging piles. The three-phase alternating current charging system is not suitable for building a high-power direct current charging station in countries with tense land resources, has the condition of large-scale popularization due to the advantages of simple arrangement of charging piles, low cost and the like, but needs to be isolated at a vehicle-mounted end to prevent interference to a power grid in the charging process. At present, an isolation mode adopted at a vehicle-mounted end is usually additionally provided with a transformer, so that the volume of the whole vehicle is increased, the cost is high, and the development of an electric vehicle is seriously hindered.
In conclusion, the prior art has the problems that the size of the whole vehicle is large and the cost is high due to the fact that the vehicle-mounted end is provided with the isolation device.
Disclosure of Invention
The application aims to provide an energy conversion device and a vehicle, and aims to solve the problems that in the prior art, the vehicle-mounted end is provided with an isolation device to cause the volume of the whole vehicle to be large and the cost to be high.
The present application is achieved in that, in a first aspect, the present application provides an energy conversion apparatus, including a reversible PWM rectifier, a motor, and a switch module, where the motor includes a first set of coils and a second set of coils, the first set of coils and the second set of coils are mutual coils for performing electromagnetic coupling, the first set of coils are connected to the reversible PWM rectifier, and the second set of coils are connected to the reversible PWM rectifier through the switch module;
an external charging port or discharging port forms a charging circuit or a discharging circuit with an external battery through the energy conversion device, and the external battery and the energy conversion device form a driving circuit; the second group of coils and the switch module are connected with an external charging port or an external discharging port, and the reversible PWM rectifier is connected with an external battery.
A second aspect of the present application provides an energy conversion device, comprising a first reversible PWM rectifier, a second reversible PWM rectifier, and a motor, wherein the motor comprises a first set of coils and a second set of coils, the first set of coils and the second set of coils are mutual coils for electromagnetic coupling, the first set of coils are connected to the first reversible PWM rectifier, and the second set of coils are connected to the second reversible PWM rectifier;
an external charging port or discharging port forms a charging circuit or a discharging circuit with an external battery through the energy conversion device, and the external battery and the energy conversion device form a driving circuit; the second group of coils is connected with an external charging port or a discharging port, and the reversible PWM rectifier is connected with an external battery.
A third aspect of the present application provides a vehicle further including the energy conversion apparatus provided in the first aspect.
The application provides an energy conversion device and a vehicle, which comprise a reversible PWM rectifier, a motor and a switch module, wherein the motor comprises a first group of coils and a second group of coils, the first group of coils and the second group of coils are mutual inductors for electromagnetic coupling, the first group of coils are connected with the reversible PWM rectifier, and the second group of coils are connected with the reversible PWM rectifier through the switch module; when the energy conversion device is connected with the charging and discharging equipment through an external charging port or a discharging port module, a charging and discharging loop is formed by an external battery, a reversible PWM rectifier, a mutual inductor in the motor and charging and discharging equipment, in the process that the energy conversion device carries out charging and discharging on charging and discharging equipment, two groups of mutual inductors which carry out electromagnetic coupling are arranged in the motor, so that the winding coil and the silicon steel sheet of the motor play a role of voltage transformation, not only has electrical isolation effect on the charging and discharging process of the energy conversion device, but also realizes the energy coupling transmission function, realizes the normal charging and discharging function between the energy conversion device and the charging and discharging equipment, and because the motor and the reversible PWM rectifier are the existing devices, the cost and the volume of the whole vehicle are not increased, and the problems of large volume and high cost of the whole vehicle caused by the fact that the vehicle-mounted end is provided with the isolation device in the prior art are solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an energy conversion device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an electric machine in an energy conversion device according to an embodiment of the present application;
fig. 3 is another schematic structural diagram of an electric machine in an energy conversion device according to an embodiment of the present application;
fig. 4 is another schematic structural diagram of an electric machine in an energy conversion device according to an embodiment of the present application;
fig. 5 is another schematic structural diagram of an electric machine in an energy conversion device according to an embodiment of the present application;
fig. 6 is another schematic structural diagram of an electric machine in an energy conversion device according to an embodiment of the present application;
fig. 7 is a circuit diagram of an energy conversion device according to an embodiment of the present application;
fig. 8 is a current path diagram of an energy conversion device according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of an energy conversion device according to a second embodiment of the present application;
fig. 10 is a circuit diagram of an energy conversion device according to a second embodiment of the present application;
fig. 11 is a current path diagram of an energy conversion device according to a second embodiment of the present application;
fig. 12 is a schematic structural diagram of a vehicle according to a third embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In order to explain the technical means of the present application, the following description will be given by way of specific examples.
In the first embodiment, as shown in fig. 1, the energy conversion apparatus includes a reversible PWM rectifier 102, a motor 103, and a switching module 104, where the motor 103 includes a first set of coils 131 and a second set of coils 132, the first set of coils 131 and the second set of coils 132 are mutual coils for performing electromagnetic coupling, the first set of coils 131 is connected to the reversible PWM rectifier 102, and the second set of coils 132 is connected to the reversible PWM rectifier 102 through the switching module 104;
the external charging port 105 or the external discharging port forms a charging circuit or a discharging circuit with the external battery 101 through the energy conversion device, and the external battery 101 and the energy conversion device form a driving circuit; the second coil 132 and the switch module 104 are connected to an external charging port 105 or a discharging port, and the reversible PWM rectifier 102 is connected to an external battery 101.
The motor coils of the motor 103 comprise at least two groups of coils, the two groups of coils are in an isolated state, the two groups of coils are mutual inductors for electromagnetic coupling, conversion and transmission of electromagnetic energy are facilitated, each group of coils comprises phase coils, each phase of coil comprises a plurality of coil branches, the branch of each phase of coil and the branches of the other phase of coils form connection points, the connection points of each group of coils are connected together, and the number of the connection points of each group of coils depends on the parallel connection structure of the windings in the motor 103; the reversible PWM rectifier 102 comprises a multi-phase bridge arm, the number of the bridge arms is configured according to the number of phases of coils of the motor 103, each phase of the bridge arm comprises two power switch units, the power switch units can be in the types of transistors, IGBTs, POS pipes and other devices, the connection point of the two power switch units in the bridge arm is connected with at least one phase of coils in the motor 103, and the power switch units in the reversible PWM rectifier 102 can be switched on and off according to external control signals; the charging port or the discharging port is an alternating current charging port or an alternating current discharging port, the alternating current charging port or the alternating current discharging port is used for being connected with alternating current charging equipment or alternating current electric equipment, the voltage of the alternating current charging equipment or the alternating current electric equipment can be acquired according to a control signal, and the energy conversion device is connected with or disconnected from the alternating current charging equipment or the alternating current electric equipment according to the control signal; the energy conversion device further comprises a control module, the control module is respectively connected with the reversible PWM rectifier 102 and the switch module 104 and sends control signals to the reversible PWM rectifier 102 and the switch module 104, the control module CAN comprise a vehicle control unit, a control circuit of the reversible PWM rectifier 102 and a BPS battery manager circuit, the vehicle control unit, the reversible PWM rectifier 102 and the BPS battery manager circuit are connected through CAN lines, and different modules in the control module control the conduction and the disconnection of a power switch in the reversible PWM rectifier 102 according to the acquired information so as to achieve the conduction of different current loops.
Wherein the energy conversion device can work in a driving mode, a charging mode and a discharging mode:
when the energy conversion device is operated in the driving mode, the external battery 101 forms a driving loop with the reversible PWM rectifier 102, the switching module 104 and the motor 103.
When the energy conversion device works in a charging mode, the external charging port 105, the energy conversion device and the external battery 101 form a charging circuit, the external charging port 105 is connected with a power supply device and supplies power to the charging circuit, when the energy conversion device works in a discharging mode, the external battery 101, the energy conversion device and the external discharging port form a discharging circuit, the external discharging port is connected with an electric device, and the discharging circuit supplies power to the electric device.
The technical effects of the energy conversion device of the embodiment of the invention are as follows: when the energy conversion device is connected with the charging and discharging equipment through an external charging port or a discharging port module, a charging and discharging loop is formed by the external battery 101, the reversible PWM rectifier 102 and the mutual inductance coil in the motor 103, and in the charging and discharging process of the energy conversion device, two groups of mutual inductance coils which are electromagnetically coupled are arranged in the motor 103, so that a winding coil and a silicon steel sheet of the motor 103 have the function of voltage transformation, namely, an electrical isolation effect is achieved on the charging and discharging process of the energy conversion device, the electrical isolation refers to the electrical isolation between the external battery 101 and the external charging port or discharging port module, the phenomenon of high-voltage electric shock caused by the contact of people and the charging port 105 or the discharging port module is avoided, the energy coupling transmission function is realized, and the normal charging and discharging functions between the energy conversion device and the charging and discharging equipment are realized, and because the motor 103 and the reversible PWM rectifier 102 are the existing devices, the cost and the volume of the whole vehicle are not increased, and the problems of large volume and high cost of the whole vehicle caused by the fact that the vehicle-mounted end is provided with the isolation device in the prior art are solved.
As an embodiment, when the switch module 104 is in the off state, the external charging port 105 forms a charging circuit or a discharging circuit through the second set of coils 132, the first set of coils 131, the reversible PWM rectifier 102 and the external battery 101 in the energy conversion device.
When the energy conversion device is connected with a charging device and is in an alternating current charging mode, the charging port 105, the motor 103, the reversible PWM rectifier 102 and the external battery 101 are in a working state according to a control signal, so that the alternating current charging device, the second group of coils 132 of the motor 103, the first group of coils 131, the reversible PWM rectifier 102 and the external battery 101 form an alternating current charging loop, after the external charging device starts working, alternating current is formed on the first group of coils 131 of the motor 103, the alternating current generates a magnetic field in silicon steel sheets of a stator and a rotor of the motor 103, and due to good electromagnetic coupling between the first group of coils 131 and the second group of coils 132, the alternating current is also generated on the second group of coils 132, and then the alternating current is converted into direct current through rectification of the reversible PWM rectifier 102 to charge the battery 101.
When the energy conversion device is connected with an alternating current electric device and is in an alternating current discharge mode, the reversible PWM rectifier 102 and the external battery 101 are in an operating state according to a control signal, so that the external battery 101, the reversible PWM rectifier 102, the first group of coils 131, the second group of coils 132 of the motor 103 and the alternating current electric device form an alternating current charging circuit, after the external battery 101 starts to operate, direct current is converted into alternating current through rectification of the reversible PWM rectifier 102, alternating current is formed on the first group of coils 131 of the motor 103, the current generates a magnetic field in silicon steel sheets of a stator and a rotor of the motor 103, and the first group of coils 131 and the second group of coils 132 are in good electromagnetic coupling correspondence, so that alternating current is also generated on the second group of coils 132, and then the alternating current electric device is discharged.
The technical effects of the embodiment are as follows: the energy conversion device is operated in a driving mode, a charging mode and a discharging mode in a time-sharing manner by forming a charging circuit or a discharging circuit by the external charging port 105, the second group coil 132, the first group coil 131, the reversible PWM rectifier 102 and the external battery 101, the external battery 101 forms a driving circuit with the reversible PWM rectifier 102, the second group coil 132 and the first group coil 131 when operating in the driving mode, the AC charging device, the second group coil 132, the first group coil 131, the reversible PWM rectifier 102 and the external battery 101 of the motor 103 form a charging circuit when operating in the charging mode, the external battery 101, the second group coil 132, the first group coil 131, the reversible PWM rectifier 102 and the AC consuming device form a discharging circuit when operating in the discharging mode, and the motor 103 is driven to output power by the driving circuit, the charging circuit and the charging circuit respectively discharge and receive charging, the charging of receiving direct current supply equipment when the electric quantity of the external battery 101 is insufficient is realized, and the discharging is carried out on the direct current supply equipment when the electric quantity of the external battery 101 is sufficient, and a driving loop, the first group of coils 131 and the second group of coils 132 are adopted in the charging circuit and the discharging circuit, so that the circuit structure is simplified, the integration level is also improved, the purposes of volume reduction and cost reduction are further achieved, and the problems of complex structure, low integration level, large volume and high cost of the existing control circuit are solved.
As an embodiment, when the switching module 104 is in the off state, the external battery 101, the reversible PWM rectifier 102, and the first set of coils 131 form a first driving circuit that drives the motor 103;
when the switch module 104 is in a conducting state, the external battery 101, the reversible PWM rectifier 102, the first set of coils 131, and the second set of coils 132 form a second driving circuit for driving the motor 103;
the energy conversion device selects the first drive circuit or the second drive circuit to work according to an external control signal.
When the switch module 104 is in an off state, the external battery 101 supplies direct current to the reversible PWM rectifier 102, the reversible PWM rectifier 102 rectifies the direct current into three-phase alternating current, and the three-phase alternating current is input to the first set of coils 131 to drive the motor 103 to operate.
When the switching module 104 is in a conducting state, the external battery 101 provides direct current to the reversible PWM rectifier 102, the reversible PWM rectifier 102 rectifies the direct current into three-phase alternating current, and the three-phase alternating current is input to the first and second sets of coils 131 and 132 to drive the motor 103 to operate.
Wherein the second driving circuit is different from the first driving circuit in that: the second drive circuit enables high-power driving of the motor 103.
The technical effects of the embodiment are as follows: by controlling the on and off of the switch module 104, the first driving circuit and the second driving circuit of the driving motor 103 are formed by the external battery 101, the reversible PWM rectifier 102 and the coil of the motor 103, and the first driving circuit or the second driving circuit is selected to work according to the driving requirements, so as to drive the motor 103 with different power requirements.
For the first set of coils 131 of the motor 103, as an embodiment, as shown in fig. 2, the number of phases of the first set of coils 131 is mxEach phase coil of the first set of coils 131 comprises nxA branch of each coil, n of each phase coilxThe coil branches are connected together to form a phase terminal, n of each phase coilxOne coil branch in the coil branches is also respectively connected with n in other phase coilsxOne of the coil branches is connected to form nxA connection point, wherein nx≥1，mxNot less than 2, and mx，nxIs an integer;
the first set of coils 131 together form nxA connection point, nxThe connection points are connected in common;
the phase terminals of the first set of coils 131 are connected to the reversible PWM rectifier 102.
N in other phase coilsxOne of the coil branches means that each of the other coils of each phase provides a coil branch, and n of each phase isxOne of the coil branches is provided with the other phase coil (n)x-1) coil branches form one connection point, all coil branches of the first set of coils 131 together forming nxAnd a connection point.
For the second set of coils 132 of the motor 103, as an embodiment, as shown in fig. 2, the number of phases of the second set of coils 132 is myEach phase coil of the second set of coils 132 includes nyA branch of each coil, n of each phase coilyThe coil branches are connected together to form a phase terminal, n of each phase coilyOne coil branch in the coil branches is also respectively connected with n in other phase coilsyOne of the coil branches is connected to form nyA connection point, wherein ny≥1，myNot less than 2, and my，nyIs an integer;
the second set of coils 132 collectively form nyA connection point, nyThe connection points are connected in common;
n in other phase coilsyOne of the coil branches means that each of the other coils of each phase provides a coil branch, and n of each phase isyOne of the coil branches is provided with the other phase coil (n)y-1) the coil branches form one connection point, all coil branches of the second set of coils 132 together forming nyAnd a connection point.
The phase terminals of the second set of coils 132 are connected to the switch module 104 and the switch module 104 is connected to the phase terminals of the first set of coils 131.
Wherein, reversible PWM rectificationM in device 102xRoad bridge arm and MyThe road and bridge arms may be a set of identical bridge arms, in which case Mx＝MyThe first set of coils 131 and the second set of coils 132 form a common junction on the reversible PWM rectifier 102; m in reversible PWM rectifier 102xRoad bridge arm and MyThe bridge legs can be two different sets of bridge legs, M in the reversible PWM rectifier 102xRoad bridge arm and mxThe number of phases in the phase windings may be the same or different, M in the reversible PWM rectifier 102yRoad bridge arm and myThe number of phases in the phase windings may be the same or different.
As an embodiment, the reversible PWM rectifier 102 includes a set of MxRoad bridge arm, mxPhase end point and M of phase windingxThe middle points of each of the road bridge arms are connected in a one-to-one correspondence manner, wherein M isx≥1，mx＝MxAnd M isxAre integers.
As an embodiment, the reversible PWM rectifier 102 includes a set of MyRoad bridge arm, myPhase end point and M of phase windingyThe middle points of each of the road bridge arms are connected in a one-to-one correspondence manner, wherein M isy≥1，my＝MyAnd M isyAre integers.
The technical effects of the embodiment of the invention are as follows: two groups of coils which are isolated from each other are arranged in the motor 103, so that the two groups of coils form a mutual induction effect, the conversion and the transmission of electromagnetic energy are realized, and the control of the output alternating current of the motor 103 is realized by setting different numbers of the coils in the two groups of coils.
In one embodiment, the number of coil branches of each phase winding of the first set of coils 131 is the same as the number of coil branches of each phase winding of the second set of coils 132, and the first set of coils 131 and the second set of coils 132 form an isobaric electromagnetic coupling.
As shown in fig. 3, as a first example: m isx＝my＝3，nx＝ny2, the number of the coil branches in the first group of three-phase coils and the second group of three-phase coils is two, the first phase coil in the first group of three-phase coils comprises a coil A1 and a coil A2,the second phase coil comprises coil B1 and coil B2, the third phase coil comprises coil C1 and coil C2, the first end of coil a2, the first end of coil B2 and the first end of coil C2 are connected together to form connection point N2, the second end of coil a2 is connected with the second end of coil a2, the second end of coil B2 is connected with the second end of coil B2, the second end of coil C2 is connected with the second end of coil C2, the first three phase coil in the second set of three phase coils comprises coil a2 and coil a2, the second phase coil comprises coil B2 and coil B2, the third phase coil comprises coil C2 and coil C2, the first end of coil a2, the first end of coil B2 and the first end of coil C2 are connected together to form connection point N2, the first end of coil a2 and the connection point N2, a second end of the coil A3 is connected to a second end of the coil a4, a second end of the coil B3 is connected to a second end of the coil B4, a second end of the coil C3 is connected to a second end of the coil C4, wherein the connection point N1 is connected to the connection point N2, the connection point N3 is connected to the connection point N4, and the windings a4-N4 and a4-N4, a4-N4 are ensured to have good mutual inductance effect, thereby facilitating the conversion and transmission of electromagnetic energy, and similarly for BC, the ABC phase of 380V ac power of the charging pile is connected to the second ends of the coil a4 and the coil a4 of the motor 103, the second end of the coil B4 and the second end of the coil B4, the second end of the coil C4 and the second end of the coil C4 of the motor 103, after the external three-phase ac power is connected, the three-phase ac coils a4, B4 and C4 are formed between the three-phase ac coils 4 and 4, namely, A3-N3 and a4-N4, B3-N3 and B4-N4, C3-N3 and C4-N4 form alternating current, and three-phase alternating current is generated between a1-N1 and a2-N2, B1-N1 and B2-N2, C1-N1 and C2-N2 due to the coupling effect between the insides of the motor 103.
As a second example, as shown in fig. 4: m isx＝my＝3，nx＝ny1, the number of coil legs in the first and second sets of three-phase coils is one, the first set of three-phase coils comprises coil a1, coil B1 and coil C1, the second set of three-phase coils comprises coil a2, coil B2 and coil C2, and coil a1The first end, the first end of the coil B1 and the first end of the coil C1 are connected in common to form a connection point N1, the first end of the coil A2, the first end of the coil B2 and the first end of the coil C2 are connected in common to form a connection point N2, the winding groups are A1-N1, B1-N2, C1-N1 and A2-N2, B2-N2 and C2-N2, the second end of the coil A1, the second end of the coil B1 and the second end of the coil C1 are connected with a three-phase arm of the reversible PWM rectifier 102 during charging, the second end of the coil A2, the second end of the coil B2 and the second end of the coil C2 are connected with an external three-phase alternating current charging pile, and the electric energy of the external three-phase alternating current charging pile is transferred to the high-phase alternating current charging pile through the rectification of the reversible PWM rectifier.
In one embodiment, the number of coil branches of each phase winding of the first set of coils 131 is different from the number of coil branches of each phase winding of the second set of coils 132, and the first set of coils 131 and the second set of coils 132 form a transformer electromagnetic coupling. As a third example, as shown in fig. 5: m isx＝my＝3，nx＝2，ny1, the stator winding of the motor 103 may be designed in a three-way manner, the number of coil branches in the first set of three-phase coils is two, the number of coil branches in the second set of three-phase coils is one, the first phase coil in the first set of three-phase coils includes coil a1 and coil a2, the second phase coil includes coil B1 and coil B2, the third phase coil includes coil C1 and coil C2, the first end of coil a1, the first end of coil B1 and the first end of coil C1 are connected in common to a neutral point N1, the first end of coil a2, the first end of coil B2 and the first end of coil C2 are connected in common to a neutral point N2, the second end of coil a1 is connected to the second end of coil a2, the second end of coil B1 is connected to the second end of coil B2, the second end of coil C1 is connected to the second end of coil C2, the second set of three-phase coil includes coil A3, coil B56 and coil a 828653, and the first end of coil C86 3, The first end of the coil B3 and the first end of the coil C3 are connected in common to form a neutral point N3, wherein the neutral point N1 is connected with the neutral point N2, and the winding components are A1-N1, B1-N2, C1-N1, A2-N2, B2-N2, C2-N2, A3-N3, B3-N3 and C3-N3. Second end of coil A1, second end of coil B1 during chargingTwo ends, the second end of the coil C1, the second end of the coil A2, the second end of the coil B2 and the second end of the coil C2 are connected with an electrically controlled three-phase bridge arm, the second end of the coil A3, the second end of the coil B3 and the second end of the coil C3 are connected with an external three-phase alternating-current charging pile, electromagnetic induction exists among three windings of each phase, the three-phase alternating-current charging pile plays a role of a transformer, electric energy of the external three-phase alternating-current charging pile is transmitted to the highly electrically controlled three-phase bridge arm, and the battery 101 is charged through the rectification function of a reversible PWM rectifier.
As shown in fig. 6, as a fourth example: the stator winding of the motor 103 may be designed in a five-way manner, the M-phase coil is a three-phase coil, the number of coil branches in the first group of three-phase coils is three, the number of coil branches in the second group of three-phase coils is two, the first phase coil in the first group of three-phase coils includes coil a1, coil a2 and coil A3, the second phase coil includes coil B1, coil B2 and coil B3, the third phase coil includes coil C1, coil C2 and coil C3, the first end of coil a1, the first end of coil B1 and the first end of coil C1 are connected together to form a neutral point N1, the first end of coil a2, the first end of coil B2 and the first end of coil C2 are connected together to a neutral point N2, the first end of coil A3, the first end of coil B3 and the first end of coil C3 are connected to a neutral point N3, the second end of coil A3 and the second end 3B 3, a second end of the coil C1 is connected with a second end of the coil C2 and a second end of the coil C3, a first phase coil in the second group of three-phase coils comprises a coil a4 and a coil a5, a second phase coil comprises a coil B4 and a coil B4, a third phase coil comprises a coil C4 and a coil C4, a first end of the coil a4, a first end of the coil B4 and a first end of the coil C4 are connected together to form a neutral point N4, a first end of the coil a4, a first end of the coil B4 and a first end of the coil C4 are connected to form a neutral point N4, a second end of the coil a4 is connected with a second end of the coil a4, a second end of the coil B4 is connected with a second end of the coil B4, the windings are formed into a4-N4, B4-N4, C4-N4-4, N-4, B3-N5, C5-N5. During charging, the second end of the coil a1, the second end of the coil B1, the second end of the coil C1, the second end of the coil a2, the second end of the coil B2, the second end of the coil C2, the second end of the coil A3, the second end of the coil B3 and the second end of the coil C3 are connected with an electrically controlled three-phase bridge arm, the second end of the coil a4, the second end of the coil B4, the second end of the coil C4, the second end of the coil a5, the second end of the coil B5 and the second end of the coil C5 are connected with an external three-phase alternating-current charging pile, and due to electromagnetic induction among five windings of each phase, the three-phase alternating-current charging pile functions as a transformer, and the electric energy of the external three-phase alternating-current charging pile is transmitted to the electrically controlled three-phase bridge arm.
It should be noted that the magnetic field strength of the first set of coils 131 is proportional to the number of the coil branches of the first set of coils 131, and the magnetic field strength of the first set of coils 131 is proportional to the magnitude of the current of the coil branches of the first set of coils 131 (the magnitude of the current of the coil branches of the first set of coils 131 reflects the magnitude of the rate of change of the magnetic flux of the first set of coils 131); the magnetic field strength of the second set of coils 132 is proportional to the number of coil branches of the second set of coils 132, and the magnetic field strength of the second set of coils 132 is proportional to the magnitude of the current flowing through the coil branches of the second set of coils 132 (the magnitude of the current flowing through the coil branches of the second set of coils 132 reflects the magnitude of the rate of change of the magnetic flux of the second set of coils 132).
Specifically, the number of first set of coils 131 is equal to the number of second set of coils 132: when the energy conversion device is driven, the current of the first group of coils 131 is controlled to be equal to the current of the second group of coils 132, so that the magnetic field intensity of the first group of coils 131 is equal to the magnetic field intensity of the second group of coils 132, the stress of the motor 103 can be uniform, and the motor 103 is driven smoothly; the isobaric electromagnetic coupling is achieved when the external charging port 105 or the discharging port module charges the external battery 101 through the energy conversion device or when the external battery 101 discharges the charging port 105 or the discharging port module through the energy conversion device. Next, the driving process, the charging process and the discharging process of two embodiments in which the number of the first group coils 131 is different from the number of the second group coils 132 will be described.
1. The number of first coils 131 is greater than the number of second coils 132:
(1) driving process of the energy conversion device:
the current of the first group of coils 131 is controlled to be smaller than the current of the second group of coils 132, so that the magnetic field strength of the first group of coils 131 is equal to that of the second group of coils 132, the induced electromotive force generated by the first group of coils 131 on the second group of coils 132 and the induced electromotive force generated by the second group of coils 132 on the first group of coils 131 are equal, the stress of the motor 103 is uniform, and the motor 103 is driven smoothly.
(2) Charging process of the external battery 101 by the external charging port 105 or the discharging port module through the energy conversion device:
due to the electromagnetic coupling of the first set of coils 131 and the second set of coils 132, the current of the first set of coils 131 is smaller than the current of the second set of coils 132, thereby realizing the step-down charging of the battery 101.
(3) Discharging process of the external battery 101 to the charging port 105 or the discharging port module through the energy conversion device:
due to the electromagnetic coupling of the first set of coils 131 and the second set of coils 132, the current of the first set of coils 131 is smaller than that of the second set of coils 132, so that the external boosting discharge of the battery 101 is realized.
2. The number of first set of coils 131 is less than the number of second set of coils 132:
(1) driving process of the energy conversion device:
controlling the current of the first group of coils 131 to be larger than the current of the second group of coils 132, so that the magnetic field strength of the first group of coils 131 is equal to that of the second group of coils 132, the induced electromotive force generated by the first group of coils 131 on the second group of coils 132 and the induced electromotive force generated by the second group of coils 132 on the first group of coils 131 are equal, the stress of the motor 103 is uniform, and the motor 103 is driven smoothly;
(2) charging process of the external battery 101 by the external charging port 105 or the discharging port module through the energy conversion device: due to the electromagnetic coupling of the first set of coils 131 and the second set of coils 132, the current of the first set of coils 131 is larger than that of the second set of coils 132, so that the battery 101 is charged in a boosting way;
(3) discharging process of the external battery 101 to the charging port 105 or the discharging port module through the energy conversion device:
due to the electromagnetic coupling of the first set of coils 131 and the second set of coils 132, the current of the first set of coils 131 is greater than that of the second set of coils 132, so that the battery 101 discharges electricity to the outside in a voltage reduction manner.
In one embodiment, the reversible PWM rectifier 102 includes three-phase arms, a first end of the external battery 101 is connected to the first end of the three-phase arm, a second end of the external battery 101 is connected to the second end of the three-phase arm, and three middle points of the three-phase arm are connected to one end of each of the motor coils of the motor 103.
The three-phase inverter comprises six power switch units, the power switches can be of transistor, IGBT, POS pipe and other device types, two power switch units form a phase bridge arm and form a three-phase bridge arm together, and the connection point of the two power switch units in each phase bridge arm is connected with a phase coil in the motor 103; the three-phase coils of the motor 103 are connected to a connection point which forms the output of the motor 103.
In one embodiment, the reversible PWM rectifier 102 includes six-phase arms, a first end of the external battery 101 is connected to the first end of the six-phase arm, a second end of the external battery 101 is connected to the second end of the six-phase arm, and six middle points of the six-phase arm are connected to one end of each of the motor coils of the motor 103.
The power switch control mode for the reversible PWM rectifier 102 may be any one or a combination of the following: if at least one bridge arm in the inverter is selected for control, the control is flexible and simple.
The optimal synchronous control mode of the bridge arm of the selection controller is synchronous on and synchronous off, so that the current of the motor 103 is increased at the same time when the motor is switched on and reduced at the same time when the motor is switched off, the current of the motor 103 tends to be equal at any moment, the resultant magnetomotive force of the motor 103 tends to be zero, the magnetic field of a stator tends to be zero, and no torque is generated by the motor 103 basically. When the inductance of motor 103 itself does not satisfy the ripple requirement, can adopt controller phase control that misplaces, 360/motor phase counts are worth to the angle of staggering, for example the three-phase staggers about 120 phase control, the positive and negative ripple of three-phase coil superposes each other like this, offset each other to can make total ripple greatly reduced, for example two-phase staggers about 180 phase control, the positive and negative ripple of two-phase coil superposes each other like this, offset each other, thereby can make total ripple greatly reduced.
The control mode of the three-phase inverter can be any one or combination of the following modes: if any one or any two of A, B, C three-phase bridge arms and three bridge arms can be realized, 7 control heating modes are realized, and the method is flexible and simple. The switching of the bridge arms can be beneficial to realizing the large, medium and small selection of heating power, 1, any phase of bridge arm power switch can be selected for control, and three phase bridge arms can be switched in turn, for example, an A phase of bridge arm works alone first, a first power switch unit and a fourth power switch unit are controlled to heat for a period of time, then a B phase of bridge arm works alone, a third power switch unit and a sixth power switch unit are controlled to heat for the same period of time, then a C phase of bridge arm works alone, a fifth power switch unit and a second power switch unit are controlled to heat for the same period of time, and then the A phase of bridge arm works, so that the three phase inverter and a three phase coil are circulated to be electrified and heated in turn; 2. any two-phase bridge arm power switches can be selected for control, and three-phase bridge arms can be switched in turn, for example, an AB-phase bridge arm works first, a first power switch unit, a fourth power switch unit, a third power switch unit and a sixth power switch unit are controlled to heat for a period of time, then a BC-phase bridge arm works, a third power switch unit, a sixth power switch unit and a second power switch unit are controlled to heat for the same time, then a CA-phase bridge arm works, a fifth power switch unit, a second power switch unit, a first power switch unit and a fourth power switch unit are controlled to heat for the same time, and then the AB-phase bridge arm works, and the steps are cycled to realize a three-phase inverter; 3. preferably, the three-phase bridge arm power switches can be selected to be controlled simultaneously, namely, the three-phase upper bridge arm is switched on simultaneously, and the three-phase lower bridge arm is switched off simultaneously; and the three-phase upper bridge arm is turned off at the same time, the three-phase lower bridge arm is turned on at the same time, the three-phase power bridge arm is equivalent to a single DC/DC, and the three-phase loops are balanced theoretically, so that three-phase currents are balanced, the three-phase inverter and the three-phase coil are heated and balanced, the three-phase currents are basically direct currents and have basically consistent average values, and the three-phase windings are symmetrical, so that the three-phase synthetic magnetomotive force in the motor 103 is basically zero, the stator magnetic field is basically zero, the motor 103 basically has no torque, and the stress of a transmission system is favorably and greatly.
As an embodiment, for the external battery 101, as an embodiment, a second switch module 110 and a first energy storage module are further included between the external battery 101 and the energy conversion module, a positive terminal of the battery 101 is connected to a first terminal of the second switch module 110, a negative terminal of the battery 101 is connected to a second terminal of the second switch module 110, a third terminal of the second switch module 110 is connected to a first terminal of the first energy storage module, and a fourth terminal of the second switch module 110 is connected to a second terminal of the first energy storage module.
The second switching module 110 is located between the battery 101 and the first energy storage module, and the second switching module 110 can connect or disconnect the battery 101 and the first energy storage module according to the control signal, so as to connect or disconnect the battery 101 and the reversible PWM rectifier 102; the first energy storage module may be an energy storage device such as a capacitor, and when the second switch module 110 is turned on, the battery 101 charges the first energy storage module through the first switch module 104 until the first energy storage module is fully charged.
The technical effects of the embodiment are as follows: set up second switch module 110 between outside battery 101 and the energy conversion module, realize controlling outside battery 101 and other module of energy conversion device to be connected or break off through controlling second switch module 110, through setting up first energy storage module, make first energy storage module pass through second switch module 110 and outside battery 101 parallel connection, can play the filtering action, because first energy storage module has the effect of charge-discharge, when battery 101 voltage appears undulant, the fluctuation of battery 101 voltage can be reduced through the charge-discharge of first energy storage module.
As for the second switch module 110, as a first implementation manner, the second switch module 110 includes a fourth switch and a sixth switch, a first end of the fourth switch is a first end of the second switch module 110, a second end of the fourth switch is a third end of the second switch module 110, a first end of the sixth switch is a second end of the second switch module 110, and a second end of the sixth switch is a fourth end of the second switch module 110.
The technical effects of the embodiment are as follows: two switches, namely a fourth switch and a sixth switch, are arranged in the second switch module 110, so that the charging of the battery 101 to the first energy storage module is realized through the control of the fourth switch and the sixth switch, and the connection or disconnection of the external battery 101 and other modules of the energy conversion device is realized.
As for the second switch module 110, as a second embodiment, the second switch module 110 includes only the fourth switch or the sixth switch described above.
This embodiment reduces the number of switches as compared with the first embodiment, and since the fourth switch and the sixth switch are connected between the battery 101 and the first energy storage module in the above embodiment, the same function can be achieved by using one switch.
The technical effects of the embodiment are as follows: a switch is further provided in the second switch module 110, so that the circuit structure is further simplified.
As a third embodiment, the first switch module 104 includes a fourth switch, a fifth switch, a resistor, and a sixth switch, a first end of the fourth switch is connected to a first end of the fifth switch and constitutes a first end of the second switch module 110, a second end of the fifth switch is connected to a first end of the resistor, a second end of the resistor is connected to a second end of the fourth switch and constitutes a third end of the second switch module 110, a first end of the sixth switch is a second end of the second switch module 110, and a second end of the sixth switch is a fourth end of the second switch module 110.
Compared with the first embodiment, the embodiment has the advantages that one branch is added, the fifth switch and the resistor are arranged on the branch, the branch is used for pre-charging the first energy storage module by the battery 101, namely, when the fifth switch is switched on to charge the first energy storage module by the battery 101, the resistor is arranged, the pre-charged current can be controlled, and the fifth switch is controlled to be switched off and the fourth switch is controlled to be switched on after the pre-charging is finished.
The technical effects of the embodiment are as follows: the branch circuit for pre-charging is arranged in the second switch module 110, so that the control of the charging current output from the battery 101 to the first energy storage module is realized, and the charging safety of the rechargeable battery 101 and the first energy storage module in the charging process is improved.
As an implementation manner of the charging port 105 or the discharging port, a second energy storage device and a third switching module are further included between the charging port 105 or the discharging port and the energy conversion device, a first end of the second energy storage device is commonly connected with a first end of the third switching module, a second end of the second energy storage device is commonly connected with a second end of the third switching module, a third end of the third switching module is connected with the first end of the charging port 105 or the discharging port, and a fourth end of the third switching module is connected with the second end of the charging port 105 or the discharging port.
The third switch module comprises a seventh switch and an eighth switch, the first end and the second end of the seventh switch are respectively the second end and the fourth end of the third switch module, the first end and the second end of the eighth switch are respectively the first end and the third end of the third switch module, the charging port 105 or the discharging port is connected with the direct current electric equipment or the direct current charging equipment, and the energy conversion device discharges the direct current electric equipment or receives the charging of the alternating current charging equipment.
The technical effects of the embodiment are as follows: the second capacitor is arranged between the charging port 105 or the discharging port and the energy conversion device, so that when the energy conversion device is charged or discharged for starting, electric energy can be stored to assist the completion of an interaction process, and in the process of charging or discharging of the energy conversion device, current passing through the motor 103 on an N line is filtered, and current ripple is further reduced.
In one embodiment, the switch module 104 includes a plurality of switches, one end of each switch is connected to one phase end point of the second set of coils 132, the other end of each switch is connected to one phase end point of the first set of coils 131 and one phase arm of the reversible PWM rectifier 102, that is, the second set of coils 132 shares an arm of the reversible PWM rectifier 102 with the first set of coils 131 through the first switch module 104, when the switch module 104 is controlled to be turned on, the second set of coils 132 is connected to an arm of the reversible PWM rectifier 102, and when the switch module 104 is controlled to be turned off, the second set of coils 132 is turned off from an arm of the reversible PWM rectifier 102.
The technical effects of the embodiment are as follows: by arranging the switch module 104 in the energy conversion device, the first group of coils 131 and the second group of coils 132 can share the same bridge arm in the reversible PWM rectifier 102, the number of the bridge arms arranged in the reversible PWM rectifier 102 is reduced, and the second group of coils 132 and the reversible PWM rectifier 102 are switched on or off by controlling the on and off of the switch module 104, so that the energy conversion device can be switched between different driving modes and charging and discharging modes.
For the control of the switch module 104, as an embodiment, when the energy conversion device is in the driving mode, the charge and discharge interface module is in the off state;
when the switch module 104 is in a closed state, the reversible PWM rectifier 102 and the external battery 101 are in a working state according to the control signal, so that the external battery 101, the reversible PWM rectifier 102, the switch module 104, the first set of coils 131 and the second set of coils 132 of the motor 103 form a driving loop of the motor 103;
when the switch module 104 is in the off state, the reversible PWM rectifier 102 and the external battery 101 are in the working state according to the control signal, so that the external battery 101, the reversible PWM rectifier 102, and the first set of coils 131 of the motor 103 form a driving circuit of the motor 103.
When the switch module 104 is in the closed state, the first group of coils 131 and the second group of coils 132 can simultaneously drive the motor 103 to output torque, so that the motor 103 can be controlled to output large torque, and when the switch module 104 is in the open state, the first group of coils 131 can drive the motor 103 to output torque, and the torque output by the motor 103 is reduced because only half of windings of the motor 103 have current.
The technical effects of the embodiment are as follows: by controlling the on and off of the switch module 104, the energy conversion device can be in different driving modes, thereby realizing the output of the torque of the motor 103.
In one embodiment, when the energy conversion device is connected to the charging apparatus and is in an ac charging mode, the switching module 104 is in an off state, the reversible PWM rectifier 102 and the external battery 101 are in an operating state according to the control signal, and the second coil set 132 of the motor 103 receives the ac voltage signal output by the charging apparatus and performs coupling transformation with the first coil set 131, so that the ac charging and discharging interface module, the second coil set 132 of the motor 103, the first coil set 131, the reversible PWM rectifier 102 and the external battery 101 form an ac charging loop.
The connection and disconnection between the battery 101 and the reversible PWM rectifier 102 can be realized by controlling the second switch module 110, the second switch module 110 is controlled to connect the reversible PWM rectifier 102 with the battery 101, the switch module 104 is controlled to be in a disconnected state, the second group of coils 132 is disconnected from the reversible PWM rectifier 102, when the charging equipment performs ac charging on the second group of coils 132, the second group of coils 132 performs ac isolated charging on the first group of coils 131 by performing coupling transformation with the first group of coils 131, and then the ac output by the first group of coils 131 is rectified into dc to charge the battery 101 by controlling the turn-off and turn-on of the power switch unit in the reversible PWM rectifier 102.
The technical effects of the embodiment are as follows: through the electromagnetic coupling between the first group of coils 131 and the second group of coils 132, the winding coils of the motor 103 have the function of voltage transformation, i.e. have the electrical isolation effect and realize the energy coupling transmission function.
As an embodiment, the reversible PWM rectifier 102 includes a first phase bridge arm, a second phase bridge arm and a third phase bridge arm, the first phase bridge arm includes a first power switch unit and a fourth power switch unit connected in series, the second phase bridge arm includes a third power switch unit and a sixth power switch unit connected in series, the third phase bridge arm includes a fifth power switch unit and a second power switch unit connected in series, an input end of the first power switch unit, an input end of the third power switch unit and an input end of the fifth power switch unit are connected in common and connected to a first end of the external battery 101, an output end of the fourth power switch unit, an output end of the sixth power switch unit and an output end of the second power switch unit are connected in common and connected to a second end of the external battery 101, an output end of the first power switch unit and an input end of the fourth power switch unit are connected and form a midpoint of the first phase bridge arm, the output end of the third power switch unit is connected with the input end of the sixth power switch to form the midpoint of the second phase bridge arm, and the output end of the fifth power switch unit is connected with the input end of the second power switch to form the midpoint of the third phase bridge arm.
In this embodiment, the reversible PWM rectifier 102 is a three-phase bridge arm, which is not described herein again.
As shown in fig. 7, the present embodiment will be specifically described below with a specific circuit configuration:
the electric machine 103 comprises two sets of three-phase coils, the number of coil branches in the first and second sets of three-phase coils being two, the first phase coil in the first set of three-phase coils comprising coil a1, coil a2, the second phase coil comprising coil B1, coil B2, the third phase coil comprising coil C1, coil C2, the first end of coil a1, the first end of coil B1 and the first end of coil C1 being connected in common to a neutral point N1, the first end of coil a2, the first end of coil B2 and the first end of coil C2 being connected in common to a neutral point N2, the second end of coil a1 being connected to the second end of coil a2, the second end of coil B1 being connected to the second end of coil B2, the second end of coil C1 being connected to the second end of coil C2, the first phase coil in the second set of three-phase coils comprising coil A3, coil a4, the second phase coil B4, coil B3, and coil C3957 comprising coil C3, Coil C4, the first end of coil A3, the first end of coil B3 and the first end of coil C3 being connected in common to a neutral point N3, the first end of coil a4, the first end of coil B4 and the first end of coil C4 being connected in common to a neutral point N4, the second end of coil A3 being connected to the second end of coil a4, the second end of coil B3 being connected to the second end of coil B4, the second end of coil C3 being connected to the second end of coil C4, wherein neutral point N1 is connected to neutral point N2, neutral point N3 is connected to neutral point N4; the reversible PWM rectifier 102 comprises a first power switch unit, a second power switch unit, a third power switch unit, a fourth power switch unit, a fifth power switch and a sixth power switch, a control end of each power switch unit is connected with a control module, the first power switch unit and the fourth power switch unit in the three-phase inverter form an A-phase bridge arm, the third power switch unit and the sixth power switch unit form a B-phase bridge arm, the fifth power switch unit and the second power switch unit form a C-phase bridge arm, the first power switch unit comprises a first upper bridge arm VT1 and a first upper bridge diode 39VD 56, the second power switch unit comprises a second lower bridge arm VT2 and a second lower bridge diode VD2, the third power switch unit comprises a third upper bridge arm VT3 and a third upper bridge diode VD3, the fourth power switch unit comprises a fourth lower bridge arm VT5 and a fourth lower bridge diode VD4, the fifth power switch unit comprises a fifth upper bridge arm VT5 and a fifth upper bridge diode VD5, the sixth power switch unit comprises a sixth lower bridge arm VT6 and a sixth lower bridge diode VD6, the first switch module 104 comprises a switch K1, a switch K2 and a switch K3, the second end of the coil A1, the second end of the coil A2, the first end of the switch K1 and the midpoint of the A-phase bridge arm are connected in common, the second end of the coil B1, the second end of the coil B2, the first end of the switch K2 and the midpoint of the B-phase bridge arm are connected in common, the second end of the coil C1, the second end of the coil C2, the first end of the switch K3 and the midpoint of the C-phase bridge arm are connected in common, the second end of the coil A3, the second end of the coil A4, the first end of the AC charge port 105 and the second end of the switch K1 are connected in common, the second end of the coil B3, the second end of the coil B6342, the second end of the AC charge port 105 and the second end of the switch K68628 are connected in, The second end of the coil C4, the third end of the AC charging port 105 and the second end of the switch C2 are connected in common, the fourth end and the fifth end of the AC charging port 105 are also connected with an AC charging pile 111, and a second switch module 110 is arranged between the capacitor C1 and the battery 101.
When the energy conversion device is in a driving mode, the switch K1, the switch K2 and the switch K3 can be opened or closed, in the closed state, a coil a1, a coil a2, a coil A3 and a coil a4 of the motor 103 are all connected with the midpoint of an a-phase bridge arm in the reversible PWM rectifier 102, a coil B1, a coil B2, a coil B3 and a coil B4 of the motor 103 are all connected with the midpoint of a B-phase bridge arm in the reversible PWM rectifier 102, a coil C1, a coil C2, a coil C3 and a coil C4 of the motor 103 are all connected with the midpoint of a C-phase bridge arm in the reversible PWM rectifier 102, the reversible PWM rectifier 102 normally works to drive the motor 103 to rotate, and further drive a vehicle to run, and the interface circuit comprises switches and other elements to ensure corresponding communication interaction and safety; when the switch K1, the switch K2 and the switch K3 are turned off, the coil a1 and the coil a2 of the motor 103 are connected to the midpoint of the a-phase arm in the reversible PWM rectifier 102, the coil B1 and the coil B2 of the motor 103 are connected to the midpoint of the B-phase arm in the reversible PWM rectifier 102, the coil C1 and the coil C2 of the motor 103 are connected to the midpoint of the C-phase arm in the reversible PWM rectifier 102, when the reversible PWM rectifier 102 drives the motor 103, only half of windings of the motor 103 have current, the torque ratio of the motor 103 is small, and the driving function is limited to a certain extent.
When the energy conversion device is in a charging mode, the switch K1 and the switch K1 are disconnected, a charging interface circuit is closed, the three-phase alternating current charging pile and the motor 103 are connected, the phase A of the charging pile is connected to the coil A1 and the coil A1 of the motor 103, the phase B of the charging pile is connected to the coil B1 and the coil B1 of the motor 103, and the phase C of the charging pile is connected to the coil C1 and the coil C1 of the motor 103, after the charging pile starts to work, three-phase alternating current is formed between the phase A1-N1, the phase B1-N1, the phase C1-N1 and the phase C1-N1, and the phase A1-N1 are in good electromagnetic coupling, and the three-phase alternating current is generated in the phase A1-N1, the phase alternating current is generated in the phase A1-N1, in the same way, the same coupling effect is generated on the phases B and C of the motor 103, so that three-phase alternating currents are generated on the phases B1-N1, B2-N2, C1-N1 and C2-N2 of the motor 103, a winding coil and a silicon steel sheet of the motor 103 play a role in transforming voltage, namely, an electrical isolation effect is achieved on input and output, and an energy coupling transmission function is realized.
The high-voltage line current flows to the middle point of the electrically-controlled ABC three-phase bridge arm, the electric control is in a rectification mode at the moment, the three-phase alternating current is rectified into direct current to charge the battery 101, the isolated charging function of the three-phase alternating current is realized, and the specific current path is shown in FIG. 8.
A second embodiment of the present invention provides an energy conversion apparatus, as shown in fig. 9, including a first reversible PWM rectifier 102, a second reversible PWM rectifier 102, and a motor 103, where the motor 103 includes a first set of coils 131 and a second set of coils 132, the first set of coils 131 and the second set of coils 132 are mutual coils for performing electromagnetic coupling, the first set of coils 131 is connected to the first reversible PWM rectifier 102, and the second set of coils 132 is connected to the second reversible PWM rectifier 102;
the external charging port 105 or the external discharging port forms a charging circuit or a discharging circuit with the external battery 101 through the energy conversion device, and the external battery 101 and the energy conversion device form a driving circuit; the second coil 132 is connected to an external charging port 105 or discharging port, and the reversible PWM rectifier 102 is connected to the external battery 101.
The difference between the second embodiment and the first embodiment is: the second set of coils 132 is directly connected to the reversible PWM rectifier 102, the first set of coils 131 and the second set of coils 132 in the motor 103 are not connected in common and are respectively connected to M-phase arms in the reversible PWM rectifier 102, for example, the first set of coils 131 and the second set of coils 132 are both three-phase coils, the reversible PWM rectifier 102 at least includes 6-phase arms, and each phase of coils in the first set of coils 131 and the second set of coils 132 is connected to one arm.
The technical effects of the embodiment are as follows: the reversible PWM rectifier 102 is respectively connected with the two groups of coils, the duty ratios of the reversible PWM rectifier and the two groups of coils are adjusted according to the rotating speed and the target torque value of the motor 103, and the motor 103 is controlled through the two groups of coils to drive the vehicle to normally run; and by controlling the power switch unit on the bridge arm connected to the two sets of coils, the reversible PWM rectifier 102 can be controlled to be on or off with the two sets of coils, respectively.
As an embodiment, the external battery 101, the first reversible PWM rectifier 102, the first set of coils 131 form a first driving circuit for driving the motor 103;
the external battery 101, the second reversible PWM rectifier 102, and the second set of coils 132 form a second driving circuit for driving the motor 103;
the energy conversion device selects the first drive circuit or the second drive circuit to work according to an external control signal.
The reversible PWM rectifier 102 is controlled to enable the first group of coils 131 and the second group of coils 132 to simultaneously drive the motor 103 to output torque, so as to control the motor 103 to output large torque, and in addition, the motor controller is controlled to enable only the first group of coils 131 to be connected to the circuit or only the second group of coils 132 to be connected to the circuit, so that the torque output by the motor 103 is reduced because only half of the windings of the motor 103 have current.
The technical effects of the embodiment are as follows: by controlling the on and off of the bridge arm in the reversible PWM rectifier 102, the energy conversion device can be in different driving modes, thereby realizing the output of the torque of the motor 103.
In one embodiment, the external charging port 105 forms a charging circuit or a discharging circuit with the second coil 132, the first coil 131, the first reversible PWM rectifier 102, the second reversible PWM rectifier 102, and the external battery 101 in the energy conversion device.
When the energy conversion device is connected with the charging equipment and is in an alternating current charging mode, the reversible PWM rectifier 102 and the external battery 101 are in an operating state according to the control signal, and the second group of coils 132 of the motor 103 receives an alternating current voltage signal output by the charging equipment and performs coupling transformation with the first group of coils 131, so that the alternating current charging equipment, the second group of coils 132 of the motor 103, the first group of coils 131, the reversible PWM rectifier 102 and the external battery 101 form an alternating current charging loop.
The second switch module 110 is arranged between the battery 101 and the reversible PWM rectifier 102, the connection and disconnection between the battery 101 and the reversible PWM rectifier 102 can be realized by controlling the second switch module 110, the reversible PWM rectifier 102 is connected with the battery 101 by controlling the second switch module 110, the reversible PWM rectifier 102 is controlled to disconnect the second group of coils 132 from the reversible PWM rectifier 102, when the charging equipment performs ac charging on the second group of coils 132, the second group of coils 132 performs ac isolation charging on the first group of coils 131 by performing coupling transformation on the first group of coils 131, and then the ac output by the first group of M-phase coils is rectified into dc by controlling the turn-off and turn-on of the power switch unit in the reversible PWM rectifier 102 to charge the battery 101.
The technical effects of the embodiment are as follows: through the electromagnetic coupling between the first group of coils 131 and the second group of coils 132, the winding coils of the motor 103 have the function of voltage transformation, i.e. have the electrical isolation effect and realize the energy coupling transmission function.
For the first and second sets of M-phase coils, as an embodiment, the number of phases of the first set of coils 131 is MxEach phase coil of the first set of coils 131 comprises nxA branch of each coil, n of each phase coilxThe coil branches are connected together to form a phase terminal, n of each phase coilxOne coil branch in the coil branches is also respectively connected with n in other phase coilsxOne of the coil branches is connected to form nxA connection point, wherein nx≥1，mxNot less than 2, and mx，nxIs an integer;
the first set of coils 131 together form nxA connection point, nxThe connection points are connected in common;
the phase terminals of the first set of coils 131 are connected to the reversible PWM rectifier 102.
The second set of coils 132 has a phase number myEach phase coil of the second set of coils 132 includes nyA branch of each coil, n of each phase coilyThe coil branches are connected together to form a phase terminal, n of each phase coilyOne coil branch in the coil branches is also respectively connected with n in other phase coilsyOne of the coil branches is connected to form nyA connection point, wherein ny≥1，myNot less than 2, and my，nyIs an integer;
the second set of coils 132 collectively form nyA connection point, nyThe connection points are connected in common;
the phase terminals of the second set of coils 132 are connected to the switch module 104 and the switch module 104 is connected to the phase terminals of the first set of coils 131.
In one embodiment, the number of coil branches of each phase winding of the first set of coils 131 is the same as the number of coil branches of each phase winding of the second set of coils 132, and the first set of coils 131 and the second set of coils 132 form an isobaric electromagnetic coupling.
In one embodiment, the number of coil branches of each phase winding of the first set of coils 131 is different from the number of coil branches of each phase winding of the second set of coils 132, and the first set of coils 131 and the second set of coils 132 form a transformer electromagnetic coupling.
As an embodiment, the reversible PWM rectifier 102 includes a set of MxRoad bridge arm, mxPhase end point and M of phase windingxThe middle points of each of the road bridge arms are connected in a one-to-one correspondence manner, wherein M isx≥1，mx＝MxAnd M isxBeing an integer, the reversible PWM rectifier 102 further includes a set MyRoad bridge arm, myPhase end point and M of phase windingyThe middle points of each of the road bridge arms are connected in a one-to-one correspondence manner, wherein M isy≥1，my＝MyAnd M isyAre integers.
For the reversible PWM rectifier 102, as an implementation manner, the reversible PWM rectifier 102 includes a first phase bridge arm, a second phase bridge arm, a third phase bridge arm, a fourth phase bridge arm, a fifth phase bridge arm and a sixth phase bridge arm, the first phase bridge arm includes a first power switch unit and a fourth power switch unit connected in series, the second phase bridge arm includes a third power switch unit and a sixth power switch unit connected in series, the third phase bridge arm includes a fifth power switch unit and a second power switch unit connected in series, the fourth phase bridge arm includes a seventh power switch unit and a tenth power switch unit connected in series, the fifth phase bridge arm includes a ninth power switch unit and a twelfth power switch unit connected in series, the sixth phase bridge arm includes an eleventh power switch unit and an eighth power switch unit connected in series, an input end of the first power switch unit, The input end of the third power switch unit, the input end of the fifth power switch unit, the input end of the seventh power switch unit, the input end of the ninth power switch unit and the input end of the eleventh power switch unit are connected in common and are connected with the first end of the external battery 101, the output end of the fourth power switch unit, the output end of the sixth power switch unit, the output end of the second power switch unit, the output end of the tenth power switch unit, the output end of the twelfth power switch unit and the output end of the eighth power switch unit are connected in common and are connected with the second end of the external battery 101, the output end of the first power switch unit and the input end of the fourth power switch unit are connected and form the midpoint of the first phase bridge arm, the output end of the third power switch unit and the input end of the sixth power switch are connected and form the midpoint of the second phase bridge arm, the output end of the fifth power switch unit and the input end of the second power switch are connected and form the midpoint of the third, the output end of the seventh power switch unit is connected with the input end of the tenth power switch to form the midpoint of the fourth phase bridge arm, the output end of the ninth power switch unit is connected with the input end of the twelfth power switch to form the midpoint of the fifth phase bridge arm, and the output end of the eleventh power switch unit is connected with the input end of the eighth power switch to form the midpoint of the sixth phase bridge arm.
In this embodiment, the reversible PWM rectifier 102 is a six-phase bridge arm, which is not described herein again.
In one embodiment, when the energy conversion device is connected to the charging equipment and is in the ac charging mode, the first phase arm, the second phase arm, the third phase arm, and the external battery 101 in the reversible PWM rectifier 102 are in an active state according to the control signal, the fourth phase arm, the fifth phase arm, and the sixth phase arm in the reversible PWM rectifier 102 are in an off state, the first coil set 131 of the motor 103 receives the ac voltage signal output by the charging equipment and performs coupling transformation with the second coil set 132, so that the ac charging and discharging interface module, the second coil set 132 of the motor 103, the first coil set 131, the first phase arm, the second phase arm, the third phase arm, and the external battery 101 form an ac charging circuit.
When the fourth phase arm, the fifth phase arm and the sixth phase arm in the reversible PWM rectifier 102 are controlled to be in an off state, the second group of coils 132 of the motor 103 and the reversible PWM rectifier 102 are in an off state, so that the first group of coils 131 and the second group of coils 132 form electromagnetic coupling, the alternating current charging and discharging interface module, the second group of coils 132 of the motor 103, the first group of coils 131, the reversible PWM rectifier 102 and the external battery 101 form an alternating current charging loop, and the reversible PWM rectifier 102 rectifies the alternating current output by the first group of coils 131 and charges the battery 101.
The technical effects of the embodiment are as follows: the reversible PWM rectifier 102 is controlled to enable the second group of coils 132 and the reversible PWM rectifier 102 to be in a disconnected state, and further electromagnetic coupling between the first group of coils 131 and the second group of coils 132 enables winding coils of the motor 103 to have a voltage transformation effect, so that an electrical isolation effect is achieved, and an energy coupling transmission function is achieved.
As shown in fig. 10, the present embodiment will be specifically described below with a specific circuit configuration:
the electric machine 103 comprises two sets of three-phase coils, the number of coil branches in the first and second sets of three-phase coils being two, the first phase coil in the first set of three-phase coils comprising coil a1, coil a2, the second phase coil comprising coil B1, coil B2, the third phase coil comprising coil C1, coil C2, the first end of coil a1, the first end of coil B1 and the first end of coil C1 being connected in common to a neutral point N1, the first end of coil a2, the first end of coil B2 and the first end of coil C2 being connected in common to a neutral point N2, the second end of coil a1 being connected to the second end of coil a2, the second end of coil B1 being connected to the second end of coil B2, the second end of coil C1 being connected to the second end of coil C2, the first three-phase coil in the second set of three-phase coils comprising coil A3, coil B3 and coil C3, the second phase coil a4 in the second set of three-phase coils, Coil B4 and coil C4, the first end of coil A3, the first end of coil B3 and the first end of coil C3 are connected in common to a neutral point N3, the first end of coil a4, the first end of coil B4 and the first end of coil C4 are connected in common to a neutral point N4, the second end of coil A3 is connected to the second end of coil a4, the second end of coil B3 is connected to the second end of coil B4, and the second end of coil C3 is connected to the second end of coil C4, wherein neutral point N1 is connected to neutral point N2 and neutral point N3 is connected to neutral point N4; the reversible PWM rectifier 102 includes a first power switch unit, a second power switch unit, a third power switch unit, a fourth power switch unit, a fifth power switch and a sixth power switch, a control end of each power switch unit is connected to the control module, the first power switch unit and the fourth power switch unit in the three-phase inverter form an a1 phase bridge arm, the third power switch unit and the sixth power switch unit form a B1 phase bridge arm, the fifth power switch unit and the second power switch unit form a C1 phase bridge arm, the first power switch unit includes a first upper bridge arm VT1 and a first upper bridge diode VD1, the second power switch unit includes a second lower bridge arm VT2 and a second lower bridge diode VD2, the third power switch unit includes a third upper bridge arm VT3 and a third upper bridge diode VD3, the fourth power switch unit includes a fourth lower bridge arm VT4 and a fourth lower bridge diode VD4, the fifth power switch unit comprises a fifth upper bridge arm VT5 and a fifth upper bridge diode VD5, the sixth power switch unit comprises a sixth lower bridge arm VT6 and a sixth lower bridge diode VD6, the reversible PWM rectifier 102 further comprises an eleventh power switch unit, a twelfth power switch unit, a thirteenth power switch unit, a fourteenth power switch unit, a fifteenth power switch and a sixteenth power switch, a control end of each power switch unit is connected with the control module, the eleventh power switch unit and the fourteenth power switch unit in the three-phase inverter form an a 2-phase bridge arm, the thirteenth power switch unit and the sixteenth power switch unit form a B2-phase bridge arm, the fifteenth power switch unit and the twelfth power switch unit form a C2-phase bridge arm, the eleventh power switch unit comprises an eleventh upper bridge arm VT11 and an eleventh upper bridge diode VD11, the twelfth power switch unit comprises a twelfth lower bridge arm 12 and a twelfth lower bridge diode VD12, the thirteenth power switch unit comprises a thirteenth upper bridge arm VT13 and a thirteenth upper bridge diode VD13, the fourteenth power switch unit comprises a fourteenth lower bridge arm VT14 and a fourteenth lower bridge diode VD14, the fifteenth power switch unit comprises a fifteenth upper bridge arm VT15 and a fifteenth upper bridge diode VD15, the sixteenth power switch unit comprises a sixteenth lower bridge arm VT16 and a sixteenth lower bridge diode VD16, the second end of the coil A1, the second end of the coil A2 and the midpoint of the bridge arm of the phase A1 are connected in common, the second end of the coil B1, the second end of the coil B2 and the midpoint of the bridge arm of the phase B1 are connected in common, the second end of the coil C1, the second end of the coil C2 and the midpoint of the bridge arm of the phase C1 are connected in common, the second end of the coil A3, the second end of the coil A4, the first end of the AC charge port 105 and the midpoint of the bridge arm of the phase A2 are connected in common, the second end of the coil B6342, the second end of the AC charge port 105 and the midpoint of the bridge arm B599 are connected in, the second end of the coil C3, the second end of the coil C4, the third end of the alternating current charging port 105 and the midpoint of the C2 phase bridge arm are connected in common, and the fourth end and the fifth end of the alternating current charging port 105 are connected with the alternating current charging pile 111.
When the energy conversion device is in a driving mode, a charging interface circuit is in a disconnected state, the safety of the charging port 105 is guaranteed, six-phase electrically-controlled six-phase bridge arms are divided into two groups, namely A1, B1, C1, A2, B2 and C2, the duty ratios of the six-phase electrically-controlled six-phase bridge arms are adjusted according to the rotating speed and the target torque value of the motor 103, the motor 103 is controlled, and the vehicle is driven to normally run.
When the energy conversion device is in a charging mode, three bridge arms of a2, B2 and C2 of the reversible PWM rectifier 102 are in an off state, that is, six power switches of the three phases are in an off state, the interface circuit is connected to an external three-phase alternating current charging pile, so that three-phase voltages of the charging pile are applied to a2-N2, B2-N2, C2-N2, a2-N2, B2-N2 and C2-N2 of the motor 103 to form three-phase alternating current, the three-phase alternating current generates an alternating magnetic field on silicon steel sheets of a stator and a rotor inside the motor 103, and because of good electromagnetic coupling among the a2-N2, the a2-N2 and the a2-N2, the a2-N2 can generate three-phase alternating current, and similarly, the B2, C2 and C2 of the motor 103 can generate the same phase coupling effect of the motor 2, three-phase alternating current is also generated on the B2-N2, the C1-N1 and the C2-N2, so that a winding coil and a silicon steel sheet of the motor 103 have the function of voltage transformation, and the input end of the charging port 105 and the output end of the external battery 101 are electrically isolated during charging or discharging, so that the energy coupling transmission function is realized.
At this time, the a1, B1 and C1 three-phase bridge arms of the reversible PWM rectifier 102 are in a rectification mode, and the a1-N1, a2-N2, B1-N1, B2-N2, C1-N1 and C2-N2 are rectified into direct current to be charged into the battery 101, so as to realize the isolated charging of the three-phase alternating current, and the specific current path is as shown in fig. 11.
Another embodiment of the present application provides a vehicle, and an electric vehicle further includes the energy conversion device provided in the first embodiment.
As shown in fig. 12, the heating and cooling circuit of the battery pack includes the following circuits: a motor drive system cooling loop, a battery cooling system loop, and an air conditioning system cooling loop. The battery cooling system loop is fused with the air-conditioning cooling system through the heat exchange plate; and the battery cooling system loop is communicated with the motor driving system cooling loop through the four-way valve. The motor drive system cooling circuit connects and disconnects the radiator by switching of the three-way valve. The motor driving system cooling loop and the battery cooling system loop are switched through the valve body, the flow direction of cooling liquid in the pipeline is changed, the flow direction of the cooling liquid heated by the motor driving system is enabled to flow to the battery cooling system, and heat is transferred from the motor driving system to the battery cooling; when the motor driving system is in a non-heating mode, the cooling liquid of the motor driving system flows through a loop A and the cooling liquid of the battery cooling system flows through a loop C by switching the three-way valve and the four-way valve; the motor is in a heating mode, the cooling liquid of the motor driving system flows through a loop B by switching the three-way valve and the four-way valve, and the purpose that the cooling liquid heated by the motor driving system flows to the battery pack cooling loop to heat the battery is achieved.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (19)

1. An energy conversion device, comprising a reversible PWM rectifier, a motor, and a switch module, wherein the motor comprises a first set of coils and a second set of coils, the first set of coils and the second set of coils are mutual coils for electromagnetic coupling, the first set of coils are connected with the reversible PWM rectifier, and the second set of coils are connected with the reversible PWM rectifier through the switch module;
an external charging port or discharging port forms a charging circuit or a discharging circuit with an external battery through the energy conversion device, and the external battery and the energy conversion device form a driving circuit; the second group of coils and the switch module are connected with an external charging port or an external discharging port, and the reversible PWM rectifier is connected with an external battery.
2. The energy conversion device of claim 1, wherein the external charging port forms a charging circuit or a discharging circuit through the second set of coils, the first set of coils, the reversible PWM rectifier, and the external battery in the energy conversion device when the switching module is in the off state.
3. The energy conversion device of claim 1, wherein the external battery, the reversible PWM rectifier, the first set of coils form a first drive circuit that drives the motor when the switching module is in an off state;
when the switch module is in a conducting state, the external battery, the reversible PWM rectifier, the switch module, the first set of coils and the second set of coils form a second driving circuit for driving the motor;
the energy conversion device selects the first driving circuit or the second driving circuit to work according to an external control signal.
4. The energy conversion device of claim 1, wherein the first set of coils have a number of phases mxEach of the first set of coilsOne-phase coil comprising nxA branch of each coil, n of each phase coilxThe coil branches are connected together to form a phase terminal, n of each phase coilxOne coil branch in the coil branches is also respectively connected with n in other phase coilsxOne of the coil branches is connected to form nxA connection point, wherein nx≥1，mxNot less than 2, and mx，nxIs an integer;
the first set of coils collectively forming nxA connection point, said nxThe connection points are connected in common;
and the phase end points of the first group of coils are connected with the reversible PWM rectifier.
5. The energy conversion device of claim 4, wherein the number of phases of the second set of coils is myEach phase coil of the second set of coils comprising nyA branch of each coil, n of each phase coilyThe coil branches are connected together to form a phase terminal, n of each phase coilyOne coil branch in the coil branches is also respectively connected with n in other phase coilsyOne of the coil branches is connected to form nyA connection point, wherein ny≥1，myNot less than 2, and my，nyIs an integer;
the second set of coils collectively forming nyA connection point, said nyThe connection points are connected in common;
and the phase end points of the second group of coils are connected with the switch module, and the switch module is connected with the phase end points of the first group of coils.
6. The energy conversion device of claim 5, wherein the number of coil legs of each phase winding of the first set of coils is the same as the number of coil legs of each phase winding of the second set of coils, the first set of coils and the second set of coils forming an equal piezoelectric magnetic coupling.
7. The energy conversion device of claim 5, wherein the number of coil legs of each phase winding of the first set of coils is different from the number of coil legs of each phase winding of the second set of coils, the first set of coils and the second set of coils forming a variable electromagnetic coupling.
8. The energy conversion device of claim 5, wherein the reversible PWM rectifier comprises a set of MxRoad bridge arm, said mxPhase end point of phase winding and MxThe middle points of each of the road bridge arms are connected in a one-to-one correspondence manner, wherein M isx≥1，mx＝MxAnd M isxAre integers.
9. The energy conversion device of claim 8, wherein m isx＝my＝Mx＝3，nx＝ny＝2。
10. An energy conversion device, comprising a first reversible PWM rectifier, a second reversible PWM rectifier and a motor, wherein the motor comprises a first set of coils and a second set of coils, the first set of coils and the second set of coils are mutual coils for electromagnetic coupling, the first set of coils are connected with the first reversible PWM rectifier, and the second set of coils are connected with the second reversible PWM rectifier;
an external charging port or discharging port forms a charging circuit or a discharging circuit with an external battery through the energy conversion device, and the external battery and the energy conversion device form a driving circuit; the second group of coils is connected with an external charging port or a discharging port, and the reversible PWM rectifier is connected with an external battery.
11. The energy conversion device of claim 10, wherein the external charging port forms a charging circuit or a discharging circuit through the second set of coils, the first reversible PWM rectifier, the second reversible PWM rectifier, and the external battery in the energy conversion device.
12. The energy conversion device of claim 10, wherein the external battery, the first reversible PWM rectifier, and the first set of coils form a first drive circuit that drives the motor;
the external battery, the second reversible PWM rectifier and the second set of coils form a second driving circuit for driving the motor;
the energy conversion device selects the first driving circuit or the second driving circuit to work according to an external control signal.
13. The energy conversion device of claim 10, wherein the first set of coils have a number of phases mxEach phase coil of the first set of coils comprising nxA branch of each coil, n of each phase coilxThe coil branches are connected together to form a phase terminal, n of each phase coilxOne coil branch in the coil branches is also respectively connected with n in other phase coilsxOne of the coil branches is connected to form nxA connection point, wherein nx≥1，mxNot less than 2, and mx，nxIs an integer;
the first set of coils collectively forming nxA connection point, said nxThe connection points are connected in common;
and the phase end points of the first group of coils are connected with the reversible PWM rectifier.
14. The energy conversion device of claim 13, wherein the number of phases of the second set of coils is myEach phase coil of the second set of coils comprising nyA branch of each coil, n of each phase coilyThe coil branches are connected together to form a phase terminal, n of each phase coilyOne coil branch in the coil branches is also respectively connected with n in other phase coilsyOne of the coil branchesThe coil branches are connected to form nyA connection point, wherein ny≥1，myNot less than 2, and my，nyIs an integer;
the second set of coils collectively forming nyA connection point, said nyThe connection points are connected in common;
and the phase end points of the second group of coils are connected with the switch module, and the switch module is connected with the phase end points of the first group of coils.
15. The energy conversion device of claim 14, wherein the number of coil legs of each phase winding of said first set of coils is the same as the number of coil legs of each phase winding of said second set of coils, said first set of coils and said second set of coils forming an equal piezoelectric magnetic coupling.
16. The energy conversion device of claim 14, wherein the number of coil legs of each phase winding of said first set of coils and the number of coil legs of each phase winding of said second set of coils are different, said first set of coils and said second set of coils forming a variable electromagnetic coupling.
17. The energy conversion device of claim 14, wherein the reversible PWM rectifier comprises a set of MxRoad bridge arm, said mxPhase end point of phase winding and MxThe middle points of each of the road bridge arms are connected in a one-to-one correspondence manner, wherein M isx≥1，mx＝MxAnd M isxAre integers.
18. The energy conversion device of claim 17, wherein m isx＝my＝Mx＝3，nx＝ny＝2。
19. A vehicle, characterized in that the vehicle comprises an energy conversion device according to any one of claims 1-18.
CN201910755485.8A 2019-08-15 2019-08-15 Energy conversion device and vehicle Active CN112389233B (en)

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